Submission #724627

#	Time	Username	Problem	Language	Result	Execution time	Memory
724627		TimDee	Homecoming (BOI18_homecoming)	C++17	31 / 100	908 ms	262144 KiB

homecoming

//   you're already the best
//             _
//   ^ ^      //
// >(O_O)<___//
//   \ __ __  \
//    \\ \\ \\\\

#include "homecoming.h"
#include <bits/stdc++.h>
using namespace std;
 
#pragma GCC optimize("O3","unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")

using ll = long long;
//#define int long long
//#define double long double
#define forn(i,n) for(int i=0; i<(n); ++i)
#define pb push_back
#define pi pair<int,int>
#define f first
#define s second 
#define vii(a,n) vector<int> a(n); forn(i,n) cin>>a[i];
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const ll inf = 1e18;
const int mod = 998244353;

int sz=1<<22;
const int _sz=1<<22;
ll t[2*_sz];
ll lazy[2*_sz];
void push(int v) {
    t[v]+=lazy[v];
    if (2*v+1<2*sz) lazy[2*v+1]+=lazy[v];
    if (2*v+2<2*sz) lazy[2*v+2]+=lazy[v];
    lazy[v]=0;
}
ll query(int v, int l, int r, int lx, int rx) {
    if (lazy[v]) push(v);
    if (rx<=l || r<=lx) return -inf;
    if (lx<=l && r<=rx) {
        return t[v];
    }
    int m=(l+r)>>1;
    ll lq=query(2*v+1,l,m,lx,rx);
    ll rq=query(2*v+2,m,r,lx,rx);
    t[v]=max(t[2*v+1],t[2*v+2]);
    return max(lq,rq);
}
ll query(int l, int r) {
    return query(0,0,sz,l,r);
}
void add(int v, int l, int r, int lx, int rx, ll x) {
    if (lazy[v]) push(v);
    if (rx<=l || r<=lx) return;
    if (lx<=l && r<=rx) {
        lazy[v]+=x;
        push(v);
        return;
    }
    int m=(l+r)>>1;
    add(2*v+1,l,m,lx,rx,x);
    add(2*v+2,m,r,lx,rx,x);
    t[v]=max(t[2*v+1],t[2*v+2]);
}
void add(int l, int r, ll x) {
    add(0,0,sz,l,r,x);
}
const int N=2e6;
ll pra[2*N+1];
ll prb[3*N+1];
int a[2*N];
int b[2*N];
ll dp[2*N+1];
ll sub,x;
int l,r;

long long solve(int N, int K, int *A, int *B) {
    //#define int long long

    int n=N, k=K;
    sz=1; while (sz<2*n+1) sz<<=1;
    forn(i,2*sz) t[i]=lazy[i]=0;
    forn(i,2*n) a[i]=A[i%n], b[i]=B[i%n];
    forn(i,2*n) pra[i+1]=pra[i]+A[i%n];
    forn(i,3*n) prb[i+1]=prb[i]+B[i%n];
    forn(i,2*n+1) dp[i]=0;

    for (int i=1; i<=2*n; ++i) {
        dp[i]=max(dp[i],dp[i-1]);
        sub=(i>=n)?dp[i-n]:0;
        l=max(0,i-n);
        r=i;
        x=query(l,r);
        dp[i] = max(dp[i],x+a[i-1]-(prb[i+k-1]-prb[i-1])-sub);
        add(i,i+1,dp[i]);
        add(0,i,a[i-1]-b[i-1]);
        if (i+k-1>=n) add(0,i+k-n,b[i+k-1-n]);
    }
    return dp[2*n];

    //#undef int
}

Compilation message (stderr)

homecoming.cpp:5:1: warning: multi-line comment [-Wcomment]
    5 | //   \ __ __  \
      | ^

• Subtask 1: 13 / 13
• Subtask 2: 18 / 18
• Subtask 3: 0 / 31
• Subtask 4: 0 / 38